VRLA AGM (Sealed Lead Acid) Batteries are maintenance free and come in a variety of voltages, sizes and capacities. You may replace your existing AGM battery with a different brand as long as the voltage and dimensions are the same. You may select a capacity (�ah� or �ampere hours�) that is slightly higher or lower than your original. If you are unsure about which replacement to select, visit our FAQ section or feel free to Contact Us.